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    ddc/ci direct PCI memory interface for some SIS video cards

    Copyright 2006 Johannes Deisenhofer j.deisenhofer@tomorrow-focus.de
    Based on nvidia.c and the sis framebuffer driver from the Kernel source.
      Copyright (C) 2001-2005 by Thomas Winischhofer, Vienna, Austria

    Copyright(c) 2004 Nicolas Boichat (nicolas@boichat.ch)
    Based on rivafb-i2c.c from the kernel source.
    Copyright 2004 Antonino A. Daplas <adaplas @pol.net>
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/io.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <unistd.h>

#include "ddcpci.h"
struct mem_data {
      char* memory; // mmaped memory
      size_t length; // mmaped memory length

struct i2c_data {
      unsigned short int ddc_base;
      u32            cstate; // Register_state

#define VGA_WR08(p,i,d)  (outb(i,d))
#define VGA_RD08(p,i)    (inb(i))

#define VGA_SR_IX       0x3c4
#define VGA_SR_DATA     0x3c5

// There is only one bus probed. More busses are probably accessible in the same register,
// probably in pairs at bit positions 2/3, 4/5 

#define SIS_I2C_SCL     0x01
#define SIS_I2C_SDA     0x02

static void sis_gpio_setscl(void* data, int state)
      u32               val;
      struct i2c_data*  ldata = (struct i2c_data*)data;

      outb(ldata->ddc_base,VGA_SR_IX );
      val = inb(VGA_SR_DATA) & 0xfc;

      if (state)
            ldata->cstate |= SIS_I2C_SCL;
            ldata->cstate &= ~SIS_I2C_SCL;

      val |= ldata->cstate;

      outb(val ,VGA_SR_DATA);

static void sis_gpio_setsda(void* data, int state)
      u32   val;
      struct i2c_data*  ldata = (struct i2c_data*)data;

      outb(ldata->ddc_base, VGA_SR_IX );
      val = inb(VGA_SR_DATA) & 0xfc;

      if (state)
            ldata->cstate |= SIS_I2C_SDA;
            ldata->cstate &= ~SIS_I2C_SDA;

      val |= ldata->cstate;

      outb(val, VGA_SR_DATA);

static int sis_gpio_getscl(void* data)
      u32               val = 0;
      struct i2c_data*  ldata = (struct i2c_data*)data;

      outb(ldata->ddc_base, VGA_SR_IX);
      if (inb(VGA_SR_DATA) & SIS_I2C_SCL)
            val = 1;

      return val;

static int sis_gpio_getsda(void* data)
      u32               val = 0;
      struct      i2c_data*   ldata = (struct i2c_data*)data;

      outb( ldata->ddc_base, VGA_SR_IX);
      if (inb(VGA_SR_DATA) & SIS_I2C_SDA)
            val = 1;

      return val;

static int init_i2c_bus(struct i2c_algo_bit_data* algo, char* PCIO, int ddc_base)
      //fprintf(stderr, "init_i2c_bus: (ddc_base: %#x)\n", ddc_base);
      // Request io Permission
            perror("Request IO Perm");
            return 0;
      struct i2c_data* data = malloc(sizeof(struct i2c_data));
      if (!data) {
            fprintf(stderr, _("sis.c:init_i2c_bus: Malloc error."));
      data->ddc_base = ddc_base;
      data->cstate   = 0;     
      algo->setsda            = sis_gpio_setsda;
      algo->setscl            = sis_gpio_setscl;
      algo->getsda            = sis_gpio_getsda;
      algo->getscl            = sis_gpio_getscl;
      algo->udelay            = 40;
      algo->timeout           = 100;
      algo->data        = data;
      /* Raise SCL and SDA */
      sis_gpio_setsda(algo->data, 1);
      sis_gpio_setscl(algo->data, 1);
      //test_bus(algo, "Boubou");
      return 1;

struct card* sis_open(struct pci_dev *dev)
      // SIS
      if (dev->vendor_id != 0x1039) {
            return 0;
/*       switch (dev->device_id) {
        case 0x6330: // PCI_DEVICE_ID_SIS_VGA_MIRAGE
                return 0;

      struct card* sis_card = malloc(sizeof(struct card));
      if (!sis_card) {
            fprintf(stderr, _("%s: Malloc error.\n"), "sis_open");
      memset(sis_card, 0, sizeof(struct card));
      sis_card->nbusses = 1;
      sis_card->i2c_busses = malloc(2*sizeof(struct i2c_algo_bit_data));

      // Note: Only first Bus is accessible
      init_i2c_bus(&sis_card->i2c_busses[0], 0, 0x11);
      return sis_card;

void sis_close(struct card* sis_card)
      int i;
      if (sis_card->data) {
            struct mem_data* data = sis_card->data;
            if ((data->memory) && (data->memory == MAP_FAILED) && (data->length)) {
                  munmap(data->memory, data->length);
      for (i = 0; i < sis_card->nbusses; i++) {

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